Fig. 6: Potential and pH effects on product selectivity.
From: Steering from electrochemical denitrification to ammonia synthesis
a Field effects on intermediates involved in N2 and N2O production on Pd. The fitted values of μ (e Å) and α (e Å2 V−1) are shown in Supplementary Table 6. b, c The (b) potential-dependent and (c) pH-dependent (0.2 V vs. RHE) reaction free energies of steps in the optimum paths towards N2 and N2O on Pd. The blue and red lines refer to steps for N2 and N2O production, respectively, where the limiting steps are marked in bold. Note that the common steps (NO → NOH* → N*) for the two products are shown in black. The OH* is adsorbed at the bridge site, while the OH* at the top and hollow sites are shown in Supplementary Fig. 17. d The experimental FE of N2 and N2O on Pd, at 0.2 V vs. RHE17.
